<schema targetNamespace="http://www.opengis.net/gml/3.3/xbt" xmlns:gmlxbt="http://www.opengis.net/gml/3.3/xbt"  xmlns:gml="http://www.opengis.net/gml/3.2" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2001/XMLSchema" xmlns:xml="http://www.w3.org/XML/1998/namespace" elementFormDefault="qualified" version="3.3.0">
	<annotation>
		<documentation>extdBasicTypes.xsd, part of GML 3.3. Copyright (c) [2011] Open Geospatial Consortium, Inc. To obtain additional rights of use, visit http://www.opengeospatial.org/legal/.</documentation>
	</annotation>
	<import namespace="http://www.opengis.net/gml/3.2" schemaLocation="../../gml/3.2.1/gml.xsd"/>
	<import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="http://www.w3.org/2001/xml.xsd"/>
	<complexType name="LanguageStringType">
		<annotation>
			<documentation>gmlxbt:LanguageStringType adds an optional xml:lang attribute to xs:string for the use within the GML schema and in GML application schemas.</documentation>
		</annotation>
		<simpleContent>
			<extension base="string">
				<attribute ref="xml:lang"/>
			</extension>
		</simpleContent>
	</complexType>
	<complexType name="CodeType">
		<annotation>
			<documentation>gmlxbt:CodeType is a generalized type to be used for a term, keyword or name. It adds a XML attribute codeSpace to a term, where the value of the codeSpace attribute (if present) shall indicate a dictionary, thesaurus, classification scheme, authority, or pattern for the term.</documentation>
		</annotation>
		<simpleContent>
			<extension base="gmlxbt:LanguageStringType">
				<attribute name="codeSpace" type="anyURI"/>
			</extension>
		</simpleContent>
	</complexType>
	<complexType name="CodeWithAuthorityType">
		<annotation>
			<documentation>gmlxbt:CodeWithAuthorityType requires that the codeSpace attribute is provided in an instance.</documentation>
		</annotation>
		<simpleContent>
			<restriction base="gmlxbt:CodeType">
				<attribute name="codeSpace" type="anyURI" use="required"/>
			</restriction>
		</simpleContent>
	</complexType>
	<complexType name="LanguageStringAuxType">
		<simpleContent>
			<extension base="gml:StringOrRefType">
				<attribute ref="xml:lang"/>
			</extension>
		</simpleContent>
	</complexType>	
	<element name="description" type="gmlxbt:LanguageStringAuxType" substitutionGroup="gml:description">
		<annotation>
			<documentation>The value of this property is a text description of the object with optional xml:lang attribute.</documentation>
		</annotation>
	</element>	
	<element name="remarks" type="gmlxbt:LanguageStringType" substitutionGroup="gml:remarks">
		<annotation>
			<documentation>The value of this property is a text description of the object with optional xml:lang attribute.</documentation>
		</annotation>
	</element>	
	<simpleType name="TimePositionUnion">
		<union memberTypes="gml:CalDate gmlxbt:OrdDate gmlxbt:WeekDate time dateTime anyURI decimal"/> 
	</simpleType>
	<simpleType name="OrdDate">
		<restriction base="string">
			<pattern value="-?[0-9]{4}-[0-9]{3}"/>
		</restriction>
	</simpleType>
	<simpleType name="WeekDate">
		<restriction base="string">
			<pattern value="-?[0-9]{4}-W(0[1-9]|[1-4][0-9]|5[0-3])(-[1-7])?"/>
		</restriction>
	</simpleType>
</schema>
